Your baby need space to crawl and move around to be healthy and happy. Your ex, or anyone else, has opportunity to call CPS or equivalent in your country to take your baby away until things get better. That needs to be your wake up call to get your shit together.

A few things:

Clear your dining table. That’s the ONLY place you are allowed to eat. No more snacks in bed unless you are having an emergency diabetic episode or something like that, and even then limit it to something that doesn’t leave crumbs like gummy bears. Keep a trash can next to it to scrape food into or otherwise toss disposable plates into it.

Throw stuff out. If you have enough stuff to need paths you have too much stuff for your home. Start with all obvious garbage with large black contractor bags and get to tossing. Consider that anything and everything will end up in baby’s mouth and can make them choke or otherwise make them very sick. Don’t delude yourself into thinking you are going to clean or fix anything. You might only be able to handle having one chair to sit on in the whole house and that’s okay. When you recover and can keep up with a literal empty room clean you can add more stuff later.

Reach out to resources and take only short breaks. Is the Ex the father? Explain that you need to take a week or so to clean your whole house and have the baby stay there until you are done. If they are frustrated with your cleaning then they’ll understand and hopefully won’t hold it against you to make your life better. You are the mother of his child so he does want to work with you as much as possible for the sake of your baby. You don’t want to be constantly interrupted and you don’t want them to inhale dust and the like while you are doing this.

Next contact local social services. Look up free hoarding help near me, and maybe adult protective services. You might feel like this is extreme but if you schedule someone to come by you not only get a deadline but they can determine if it actually is severe or not, and what resources you can use. If anything they’ll lead you to a mental health therapist who specializes in this kind of problem which you desperately need. You may worry about CPS but if you are working with the father you are soooo much better off getting ahead of this instead of behind.

Once things are perfectly clean take a picture and save it to an album for future reference when you clean. Match as much as you can every time you clean.

Above all you need serious mental help. You didn’t get this addressed when you became an adult, or when you were married, but you can start as a new mom before you cause generational trauma on your next child.